Azo dyes

ABSTRACT

Disperse dyes of formula ##STR1## wherein D is the radical of a diazo component of formula ##STR2## Z 1  is a radical of formula ##STR3## Z 2  is hydrogen or a radical of formula (4), X is hydrogen, halogen, CF 3 , R 3 , OR 3 , NH--CO--R 7 , NH--CO--OR 8 , NH--SO 2  --R 7  or ##STR4## wherein R 3  is C 1  -C 6  alkyl; R 4  and R 5  are each independently of the other hydrogen, C 1  -C 4  alkyl or C 1  -C 4  alkoxy-C 2  -C 4  alkyl; R 7  is hydrogen, C 1  -C 6  alkyl, C 1  -C 4  alkoxy-C 1  -C 4  alkyl or phenyl; and R 8  is C 1  -C 6  alkyl or C 1  -C 4  alkoxy-C 2  -C 4  alkyl; A 1  is hydrogen, halogen, SO 2  R 3 , CF 3 , NO 2  or CN; A 2  is hydrogen, halogen or CN; A 3  is hydrogen or halogen, with the proviso that at least one of the substituents X, A 1 , A 2  and A 3  may not be hydrogen, and A 4  is hydrogen, halogen, nitro, R 3 , NHCOR 3  or OR 3 .

This application is a continuation of application Ser. No. 08/203,857, filed on Feb. 28, 1994, now abandoned, which is a continuation of application Ser. No. 08/011,932, filed Feb. 1, 1993, now abandoned.

The present invention relates to disperse dyes, to their preparation and to the use thereof for dyeing textile materials.

Disperse dyes, i.e. dyes which are devoid of water-solubilising groups, have long been known in the art and are used for dyeing hydrophobic textile material. Often, however, the resultant dyeings are not fast to thermomigration. This problem occurs in particular with red to blue shades.

To eliminate this defect, special dyes have already been developed whose diffusion capacity is as low as possible owing to their molecular size and/or bulkiness. However, this characteristic often makes dyeing with such dyes difficult, as they cannot be used, or they have only very limited use, for dyeing by the exhaust process and, even in the thermosol process, they usually require undesirably high fixation temperatures.

It is an object of this invention to provide disperse dyes with which dyeings are obtained that are very fast to thermomigration and which nevertheless have a good build-up capacity in the exhaust and thermosol processes as well as in textile printing. The dyes are also suitable for discharge printing.

The dyes of this invention have the formula ##STR5## wherein D is the radical of a diazo component of formula ##STR6## Z₁ is a radical of formula ##STR7## Z₂ is hydrogen or a radical of formula (4), X is hydrogen, halogen, CF₃, R₃, OR₃, NH--CO--R₇, NH--CO--OR₈, NH--SO₂ --R₇ or ##STR8## wherein R₃ is C₁ -C₆ alkyl,

R₄ and R₅ are each independently of the other hydrogen, C₁ -C₄ alkyl or

C₁ -C₄ alkoxy-C₂ -C₄ alkyl,

R₇ is hydrogen, C₁ -C₆ alkyl, C₁ -C₄ alkoxy-C₁ -C₄ alkyl or phenyl and

R₈ is C₁ -C₆ alkyl or C₁ -C₄ alkoxy-C₂ -C₄ alkyl,

A₁ is hydrogen, halogen, SO₂ R₃, CF₃, NO₂ or CN,

A₂ is hydrogen, halogen or CN,

A₃ is hydrogen or halogen, with the proviso that at least one of the substituents X, A₁, A₂ and A₃ may not be hydrogen, and

A₄ is hydrogen, halogen, nitro, R₃, NHCOR₃ or OR₃.

Within the scope of this invention, alkyl will be generally understood as meaning straight chain, branched or cyclic alkyl groups. Typical examples of such groups are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, tert-amyl (1,1-dimethylpropyl), 1,1,3,3-tetramethylbutyl, hexyl, 1-methylpentyl, neopentyl, cyclopentyl, cyclohexyl, as well as the corresponding isomers. The alkyl groups preferably contain 1 to 6, more particularly 1 to 4, carbon atoms, unless otherwise specifically indicated.

Suitable alkoxy groups are preferably those containing 1 to 4 carbon atoms, typically methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy or tert-butoxy.

Halogen will be generally understood as meaning fluoro, bromo or iodo and, preferably, chloro.

In especially useful dyes of formula (1) X is preferably hydrogen, C₁ -C₂ alkyl, C₁ -C₄ alkoxy, chloro, C₁ -C₄ alkylcarbonylamino, C₁ -C₄ alkoxycarbonylamino, C₁ -C₄ alkoxy-C₁ -C₄ alkylcarbonylamino, C₁ -C₄ -alkoxy-C₂ -C₄ alkoxycarbonylamino, C₁ -C₄ alkylsulfonylamino, or ##STR9## wherein R₄ and R₅ are each independently of the other hydrogen, C₁ -C₄ alkyl or C₁ -C₄ alkoxy-C₂ -C₄ alkyl.

Particularly preferred meanings of X are C₁ -C₂ alkyl, C₁ -C₄ alkylcarbonylamino, C₁ -C₄ alkoxycarbonylamino, C₁ -C₄ alkoxy-C₁ -C₄ alkylcarbonylamino or C₁ -C₄ alkoxy-C₂ -C₄ alkoxycarbonylamino.

In particularly useful compounds of formula (1), D is a radical of formula (2), wherein A₁ is preferably chloro, bromo, cyano, nitro, CF₃ or hydrogen, A₂ is hydrogen, chloro, bromo or cyano and A₃ is hydrogen. Among this group of compounds, particularly interesting compounds are those in which A₁ is chloro, cyano or nitro and A₂ is hydrogen, chloro, bromo or cyano.

Z₁ and Z₂ may be different from each other, but are preferably identical.

Owing to their good tinctorial properties, especially preferred dyes are those of formula ##STR10## wherein A₁ is chloro, bromo, cyano, nitro, CF₃ or hydrogen,

A₂ is hydrogen, chloro, bromo or cyano,

X is hydrogen, C₁ -C₂ alkyl, C₁ -C₄ alkoxy, chloro, formylamino, C₁ -C₄ alkylcarbonylamino, C₁ -C₄ alkoxycarbonylamino, C₁ -C₄ alkoxy-C₁ -C₄ alkylcarbonylamino, C₁ -C₄ alkoxy-C₂ -C₄ alkoxycarbonylamino, C₁ -C₄ alkylsulfonylamino, or ##STR11## wherein R₄ and R₅ are each independently of the other hydrogen, C₁ -C₄ alkyl or C₁ -C₄ alkoxy-C₂ -C₄ alkyl, and

Z₁ is a radical of formula ##STR12## and Z₂ is hydrogen or has the same meaning as Z₁.

Among this group of compounds, especially preferred compounds are those wherein

A₁ is chloro, cyano or nitro,

A₂ is hydrogen, chloro, bromo or cyano,

X is C₁ -C₂ alkyl, C₁ -C₄ alkylcarbonylamino, C₁ -C₄ alkoxycarbonylamino, C₁ -C₄ alkoxy-C₁ -C₄ alkylcarbonylamino or C₁ -C₄ alkoxy-C₂ -C₄ alkoxycarbonylamino,

Z₁ is CH₂ COOCH₃, and

Z₂ is hydrogen or CH₂ COOCH₃.

The novel azo dyes of formula (1) can be prepared by methods which are known per se, conveniently by diazotising a compound of formula ##STR13## and coupling the diazonium salt of this compound to a coupling component of formula ##STR14## wherein A₁, A₂, A₃, A₄, X, Z₁ and Z₂ are as defined for formula (1).

The diazotisation of the compounds of formula (6) or (7) is carried out in per se known manner, conveniently with sodium nitrite in acid, typically hydrochloric or sulfuric acid, aqueous medium. The diazotisation can, however, also be carried out with other diazotising agents, conveniently with nitrosylsulfuric acid. The reaction medium of the diaziotisation may contain an additional acid, typically phosphoric acid, sulfuric acid, acetic acid, propionic acid, hydrochloric acid or a mixture of these acids, for example a mixture of phosphoric acid and acetic acid. The diazotisation is conveniently carried out in the temperature range from -10° to +30° C., typically from -10° C. to room temperature.

The coupling of the diazotised compound of formula (6) or (7) to the coupling component of formula (8) is likewise carried out in known manner, conveniently in acid, aqueous or aqueous-organic medium, preferably in the temperature range from -10° to +30° C., most preferably below -10° C. Suitable acids include hydrochloric acid, acetic acid, sulfuric acid or phosphoric acid. Diazotisation and coupling may be carried out utilising a single vessel for diazotisation and coupling, i.e. in the same reaction medium.

The diazo components of formulae (6) and (7) are known or can be prepared in per se known manner.

Some of the coupling components of formula (8) are also known or they can be prepared in per se known manner.

A further object of the invention is the process for the preparation of coupling components of formula ##STR15## wherein Z₃ is a radical of formula --CH₂ --COOC₁ -C₆ alkyl and

Z₄ is hydrogen or Z₃, and

X₁ is as defined for formula (9), which process comprises reacting an aniline of formula ##STR16## wherein X₁ is as defined for formula (9), with a C₁ -C₆ alkyl ester of a haloacetic acid, conveniently with methyl bromoacetate, methyl chloroacetate, ethyl bromoacetate, ethyl chloroacetate, propyl bromoacetate, propyl chloroacetate, n-butyl bromoacetate and n-butyl chloroacetate. This reaction is preferably carried out at elevated temperature, conveniently in the range from 60° to 120° C., in the presence of an acid acceptor such as sodium acetate or sodium carbonate, and in the presence or absence of an inert solvent.

The coupling components of formula ##STR17## are novel, wherein X₁ is halogen, CF₃, R₃, OR₃, NH--CO--R₆, NH--CO--OR₃, NH--SO₂ --R₆ or ##STR18## wherein R₃ is C₁ -C₆ alkyl,

R₄ and R₅ are each independently of the other hydrogen, C₁ -C₄ alkyl or

C₁ -C₄ alkoxy-C₂ -C₄ alkyl, and

R₆ is C₂ -C₆ alkyl, C₁ -C₄ alkoxy-C₁ -C₄ alkyl or phenyl.

The coupling components of formula (9) constitute a further object of this invention. They are typically prepared by reacting an aniline of formula ##STR19## wherein X₁ is as defined for formula (9), with methyl bromoacetate. The reaction is preferably carried out as described above.

The novel compounds of formula (1) can be used as dyes for dyeing and printing semi-synthetic and, preferably, synthetic hydrophobic fibre materials, especially textile materials. Textile materials made from blends that contain such semi-synthetic or synthetic hydrophobic textile materials can also be dyed or printed with the novel compounds.

Semi-synthetic textile materials are in particular cellulose acetate and cellulose triacetate.

Synthetic hydrophobic textile materials consist primarily of linear aromatic polyesters, typically those from terephthalic acid and glycols, especially ethylene glycol, or condensates of terephthalic acid and 1,4-bis(hydroxymethyl)cyclohexane; from polycarbonates, typically those from α,α-dimethyl-4,4'-dihydroxydiphenylmethane and phosgene, or polyvinyl chloride and polyamide fibres.

The novel compounds are applied to the textile materials by known dyeing methods. Typically, polyester materials are dyed from an aqueous dispersion by the exhaust process in the presence of customary anionic or nonionic dispersants and in the presence or absence of customary swelling agents (carriers) in the temperature range from 80° to 140° C. Cellulose acetate is preferably dyed in the temperature from about 65° to 85° C., and cellulose triacetate in the temperature range up to 115° C.

The novel dyes do not stain wool and cotton simultaneously present in the dyebath or effect only minor staining (very good resist), so that they can also readily be used for dyeing polyester/wool and polyester/cellulose blends.

The novel dyes are suitable for dyeing by the thermosol process, for exhaust dyeing and for printing.

The textile material may be in any form of presentation, including fibres, thread, or nonwoven fabric, or as woven or knitted fabric.

It is expedient to convert the novel dyes, before use, into a dye formulation. This is done by milling the dye to an average particle size of 0.1 to 10 microns. Milling can be carried out in the presence of a dispersant. Typically, the dried dye is milled with a dispersant, or kneaded in paste form with a dispersant, and thereafter dried under vacuum or by spray drying. Printing pastes and dyebaths can be prepared by adding water to the formulations so obtained.

The customary thickeners will be used for printing. Typical examples of such thickeners are alginates, British gum, gum arabic, crystal gum, carob bean gum, tragacanth, carboxymethyl cellulose, hydroxyethyl cellulose, starch or synthetic products, including polyacrylamides, polyacrylic acid or copolymers thereof, or polyvinyl alcohols.

The cited materials, especially polyester material, are dyed with the novel dyes in level orange and red to blue shades having very good end-use properties, in particular good lightfastness and fastness to heat-setting, pleating and chlorine, and wetfastness properties such as fastness to water, perspiration and washing. The dyeings are also distinguished by very good rubfastness. The good fastness to thermomigration of the dyeings merits special mention.

The novel dyes can also be readily used for obtaining mixed shades in conjunction with other dyes. It is, of course, also possible to use mixtures of the novel dyes with one another.

In addition, the novel dyes are very suitable for dyeing hydrophobic textile material from supercritical CO₂.

Further objects of the invention are the aforementioned use of the azo dyes of formula (1) and a process for dyeing or printing semi-synthetic or synthetic hydrophobic material, preferably textile material, which comprises applying to, or incorporating in, said material one or more then one compound of formula (1). The hydrophobic fibre material is preferably polyester textile material. Further substrates which can be treated by the process of the invention and preferred process conditions have been discussed above in the more detailed description of the use of the compounds of formula (1).

The hydrophobic fibre material, preferably polyester textile material, dyed or printed by the instant process, also constitutes an object of the invention.

The novel dyes of formula (1) are also suitable for modern marking methods, for example heat transfer printing.

The invention is illustrated in more detail by the following non-limitative Examples in which, unless otherwise indicated, parts and percentages are by weight.

EXAMPLE 1

A mixture of 10.7 g of m-toluidine, 40 ml of methyl bromoacetate, 60 ml of methanol and 23.3 g of sodium carbonate is stirred for 8 hours at reflux temperature. The mixture is then cooled to room temperature and filtered. The filtrate is concentrated on a rotary evaporator and the residue is then distilled. At 136°-153° C./2 mbar 31 g of a yellow viscous oil of formula ##STR20## is obtained.

3.3 g of 2-cyano-4-nitroaniline are diazotised in known manner in concentrated sulfuric acid and the resultant diazonium salt is coupled at pH 3-5 to an equivalent amount of the above coupling component. The crude product obtained by filtration is taken up in 100 ml of methanol and, after stirring for 2 hours at reflux temperature, the product is isolated hot by filtration. This purification step is repeated. The product is dried, giving 6.1 g of crystals with a melting point of 192°-205° C. The dye has the formula ##STR21## and dyes polyester textile material in a red shades. These dyeings have good fastness properties, in particular good fastness to thermomigration.

EXAMPLE 2

A mixture of 16.4 g of m-aminopropionanilide, 23.3 g of sodium carbonate and 50 ml of methyl chloroacetate is stirred for 9 hours at 100° C. After cooling to room temperature, the reaction mixture is diluted with 50 ml of acetone and filtered. Acetone and excess methyl chloroacetate are distilled from the filtrate, giving a brown oil which contains the two compounds of formulae ##STR22## in the ratio of about 1:1.

The diazonium salt of 2-cyano-4-nitroaniline is coupled to the above described mixture of coupling components to give a mixture of dyes of formulae ##STR23## The mixture purified in methanol as described in Example 1 melts at 171°-189° C. and dyes polyester textile material in a red shade. The dyeings have good fastness properties, in particular good fastness to thermomigration.

EXAMPLE 3

A mixture of 15 g of m-aminoacetanilide, 11.5 g of sodium carbonate, 50 ml of methanol and 9.5 ml of methyl bromoacetate is stirred for 4 hours at 65° C. After cooling and filtration, the entire filter residue is recrystallised from 100 ml of water at pH 5. giving 16.5 g of colourless crystals of formula ##STR24## with a melting point of 108°-110° C.

This compound is coupled to the diazonium salt of 2-cyano-4-nitroaniline in the above described manner to give the dye of formula ##STR25## which dyes polyester textile material in a red shade. The dyeings have good fastness properties, in particular good fastness to thermomigration.

EXAMPLES 4-60

The following dyes can also be prepared in the manner described in Examples 1 to 3. They dye polyester textile material in the shades indicated in the second last column of Table 1. ##STR26##

                                      TABLE 1                                      __________________________________________________________________________     Ex.                                                                               A.sub.1                                                                             A.sub.2                                                                           A.sub.3                                                                          X          Shade   λ.sub.max (EtOH)                        __________________________________________________________________________      4 NO.sub.2                                                                            H  H H          scarlet 466 nm                                          5 CN   H  H H          scarlet 474 nm                                          6 NO.sub.2                                                                            Cl H H          reddish brown                                                                          468 nm                                          7 CN   Br H H          reddish brown                                                                          484 nm                                          8 Cl   H  H CH.sub.3   brown   458 nm                                          9 NO.sub.2                                                                            Br H CH.sub.3   claret  488 nm                                         10 NO.sub.2                                                                            H  H NHCOCH.sub.3                                                                              red     500 nm                                         11 NO.sub.2                                                                            H  H NHCOCH.sub.2 CH(CH.sub.3).sub.2                                                           red     510 nm                                         12 NO.sub.2                                                                            H  H NHCOC.sub.2 H.sub.5                                                                       red     502 nm                                         13 NO.sub.2                                                                            H  H NHCOOC.sub.2 H.sub.5                                                                      red     502 nm                                         14 CN   H  H NHCOCH.sub.3                                                                              red     508 nm                                         15 CN   H  H NHCOOC.sub.2 H.sub.5                                                                      red     506 nm                                         16 CN   H  H NHCOC.sub.2 H.sub.5                                                                       red     508 nm                                         17 Cl   H  H NHCOCH.sub.3                                                                              scarlet 486 nm                                         18 CF.sub.3                                                                            H  H NHCOCH.sub.3                                                                              scarlet 486 nm                                         19 NO.sub.2                                                                            CN H NHCOC.sub.2 H.sub.5                                                                       violet  558 nm                                         20 CN   H  H OCH.sub.3  red     502 nm                                         21 Cl   H  H NHCONH.sub.2                                                                              red     500 nm                                         22 NO.sub.2                                                                            H  H NHCO-phenyl                                                                               red                                                    23 CN   H  H NHCONH.sub.2                                                                              red     520 nm                                         24 NO.sub.2                                                                            Br H NHCONH.sub.2                                                                              ruby                                                   25 NO.sub.2                                                                            H  H CH.sub.3   scarlet 480 nm                                         26 CN   H  H CF.sub.3   orange  470 nm                                         27 Cl   H  H OCH.sub.3  scarlet 478 nm                                         28 CN   Br H NHCOCH.sub.3                                                                              violet  542 nm                                         29 NO.sub.2                                                                            Br H Cl         brown   464 nm                                         30 CN   H  H NHCOH      red                                                    31 Cl   H  H NHCOC.sub.2 H.sub.5                                                                       scarlet 486 nm                                         32 H    H  H NHCOCH.sub.2 OCH.sub.3                                                                    orange  464 nm                                         33 CN   Cl H CH.sub.3   claret  500 nm                                         34 NO.sub.2                                                                            Cl H CF.sub.3   brown                                                  35 SO.sub.2 CH.sub.3                                                                   Br H NHCOC.sub.2 H.sub.5                                                                       reddish brown                                          36 NO.sub.2                                                                            H  H NHCOOCH.sub.3                                                                             red     502 nm                                         37 CN   H  H NHCONHC.sub.3 H.sub.7                                                                     ruby                                                   38 H    H  H NHCOCH.sub.3                                                                              orange  464 nm                                         39 Cl   H  H NHCON(CH.sub.3).sub.2                                                                     red     502 nm                                         40 Cl   H  H NHCONHC.sub.2 H.sub.4 OCH.sub.3                                                           red                                                    41 CN   H  H NHSO.sub.2 CH.sub.3                                                                       scarlet 473 nm                                         42 H    H  H NHCOC.sub.2 H.sub.5                                                                       orange  468 nm                                         43 NO.sub.2                                                                            Cl H NHCOCH.sub.3                                                                              ruby    518 nm                                         44 CN   H  H NHCOOCH.sub.3                                                                             red     506 nm                                         45 Cl   H  H CF.sub.3   orange  450 nm                                         46 NO.sub.2                                                                            H  Cl                                                                               NHCOCH.sub.3                                                                              ruby                                                   47 Br   BR H NHCOCH.sub.3                                                                              brown                                                  48 SO.sub.2 CH.sub.3                                                                   H  H NHCOOC.sub.2 H.sub.5                                                                      brown                                                  49 CF.sub.3                                                                            Br H OCH.sub.3  brown                                                  50 Cl   Br H H          ochre                                                  51 SO.sub.2 CH.sub.3                                                                   H  H OCH.sub.3  brown                                                  52 CN   CF.sub.3                                                                          H NHCOCH.sub.3                                                                              ruby                                                   53 CF.sub.3                                                                            H  H OCH.sub.3  scarlet 472 nm                                         54 CF.sub.3                                                                            Br H CH.sub.3   brown                                                  55 NO.sub.2                                                                            H  Cl                                                                               CH.sub.3   ruby                                                   56 CN   H  H NHCOOC.sub.2 H.sub.4 OCH.sub.3                                                            red     506 nm                                         57 Cl   H  H NHCOCH.sub.2 OCH.sub.3                                                                    red     484 nm                                         58 CN   CN H NHCOCH.sub.3                                                                              violet  568 nm                                         59 CN   H  H NHCOC.sub.2 H.sub.4 OC.sub.2 H.sub.5                                                      red     508 nm                                         60 Cl   Cl H Cl         ochre   404 nm                                         __________________________________________________________________________

EXAMPLES 61-69

The following dyes can also be prepared in the manner described in Examples 1 to 3. They dye polyester textile material in the shades indicated in the second last column of Table 2.

                  TABLE 2                                                          ______________________________________                                          ##STR27##                                                                     Ex.  A.sub.1                                                                               A.sub.2                                                                               A.sub.3                                                                            X         Shade λ.sub.max                        ______________________________________                                                                                (EtOH)                                  61   Cl     Cl     H   Cl        ochre 404 nm                                  62   Cl     H      H   NHCOCH.sub.3                                                                             scarlet                                                                              500 nm                                  63   Cl     H      H   NHCONH.sub.2                                                                             red   512 nm                                  64   CN     H      H   CH.sub.3  red   490 nm                                  65   Cl     H      H   NHCONHC.sub.3 H.sub.7                                                                    red                                           66   CN     H      H   NHCOCH.sub.3                                                                             red   518 nm                                  67   CN     H      H   NHCOC.sub.2 H.sub.5                                                                      red   516 nm                                  68   CN     H      H   CF.sub.3  scarlet                                       69   NO.sub.2                                                                              NO.sub.2                                                                              Cl  OCH.sub.3 claret                                                                               510 nm                                  ______________________________________                                    

EXAMPLE 70

The diazonium salt of 4-aminoazobenzene is coupled to the compound of formula ##STR28## in the manner described in Example 1 to give the dye of formula ##STR29## which dyes polyester textile material in an orange shade. The dyeings have good fastness properties, in particular good fastness to thermomigration. The following dyes can also be prepared in accordance with this Example. They dye polyester textile material in the shades indicated in the second last column of the Table 3.

                  TABLE 3                                                          ______________________________________                                          ##STR30##                                                                     Ex.   A.sub.4      X        Shade λ.sub.max (EtOH)                      ______________________________________                                         71    H            H        orange                                                                               436 nm                                       72    m-OCH.sub.3  CH.sub.3 orange                                             73    m-NHCOC.sub.2 H.sub.5                                                                       H        orange                                             74    p-NO.sub.2   OCH.sub.3                                                                               orange                                             ______________________________________                                    

EXAMPLE 75

The diazonium salt of 2,5-dichloro-4-nitroaniline is coupled by the method described in Example 1 to the coupling component used in Example 70 to give the dye of formula ##STR31## which dyes polyester textile material in a scarlet shade. The dyeings have good fastness properties, in particular good fastness to thermomigration.

EXAMPLE 76

1 g of the dye described in Example 1, 17 g of water and 2 g of a commercial dispersant of the dinaphthylmethane disulfonate type are milled in a sand mill and converted into a 5% dispersion.

A 0.5% dyeing (based on pigment and substrate) is produced with this formulation on polyester fabric by the exhaust process at 130° C. and given a reductive afterclear. The red dyeing so obtained has very good end-use properties and, in particular, excellent fastness to thermomigration.

Very good fastness properties can also be achieved by dyeing a polyester/cotton blend (67:33) by the thermsol process (10 g/l of dye, pick-up 50%, setting temperature 210° C.).

To test the fastness to thermomigration, the dyed material is treated with a a textile softener of the distearyl diethylenetriamine type and then heated for 30 seconds to 180° C. The rubfastness and washfastness (60° C.) of the sample are then tested.

EXAMPLE 77

A mixture of 50 g of 3-aminoacetanilide, 180 g of methyl chloroacetate, 48 g of sodium carbonate and 6 g of sodium bromide is heated to 115° C. with evolution of CO₂ and stirred for 10 hours at this temperature. The water of reaction is distilled continuously from the reactor as an azeotropic mixture (boiling point 95° C.) with methyl chloroacetate. After cooling, the organic phase is washed with 250 ml of water and subsequently distilled under reduced pressure to leave, as residue, 98 g of the compound of formula ##STR32## in the form of a brown oil which solidifies upon cooling to room temperature.

In accordance with the general procedure described in Example 77, the following compounds of formula ##STR33## listed in Table 4 are prepared.

                  TABLE 4                                                          ______________________________________                                                               Appearance                                                                     of the crude                                                                   product at room                                                                            mp                                           X.sub.2    Reaction time                                                                             temperature (CH.sub.3 OH)                                ______________________________________                                         NHCOOC.sub.2 H.sub.5                                                                      15 h       oil                                                      NHCOC.sub.2 H.sub.5                                                                       10 h       crystalline 104-110° C.                           NHCOCH.sub.2 OCH.sub.3                                                                    15 h       crystalline  96-100° C.                           OCH.sub.3  16 h       oil                                                      NHSO.sub.2 CH.sub.3                                                                       20 h       oil                                                      CF.sub.3   90 h       oil                                                      ______________________________________                                    

EXAMPLE 78

A mixture of 50 g of 3-aminoacetanilide, 180 g of methyl chloroacetate, 34 g of lithium carbonate and 5 g of lithium bromide is heated to 115° C. with evolution of CO₂ and stirred for 8 hours at this temperature. The water of reaction is distilled continuously from the reactor as an azeotropic mixture (boiling point 95° C.) with methyl chloroacetate. After cooling, the organic phase is washed with 250 ml of water and subsequently distilled under reduced pressure to leave, as residue, 87 g of the compound of formula ##STR34## in the form of a brown oil which solidifies upon cooling to room temperature.

EXAMPLE 79

A mixture of 50 g of 3-aminoacetanilide, 180 g of methyl chloroacetate, 62 g of potassium carbonate and 7 g of potassium bromide is heated to 115° C. with evolution of CO₂ and stirred for 8 hours at this temperature. The water of reaction is distilled continuously from the reactor as an azeotropic mixture (boiling point 95° C.) with methyl chloroacetate. After cooling, the organic phase is washed with 250 ml of water and subsequently distilled under reduced pressure to leave as residue, the compound of formula ##STR35## in the form of a brown oil which solidifies upon cooling to room temperature.

EXAMPLE 80

A mixture of 50 g of 3-aminoacetanilide, 180 g of methyl chloroacetate, 48 g of sodium carbonate and 9 g of methyl bromoacetate is heated to 115° C. with evolution of CO₂ and stirred for 10 hours at this temperature. The water of reaction is distilled continuously from the reactor as an azeotropic mixture (boiling point 95° C.) with methyl chloroacetate. After cooling, the organic phase is washed with 250 ml of water and subsequently distilled under reduced pressure to leave, as residue, the compound of formula ##STR36## in the form of a brown oil which solidifies upon cooling to room temperature.

EXAMPLE 81

A mixture of 50 g of 3-aminoacetanilide, 180 g of methyl chloroacetate, 48 g of sodium carbonate and 1 g of potassium iodide is heated to 100° C. with evolution of CO₂ and stirred for 8 hours at this temperature. The water of reaction is distilled continuously from the reactor as an azeotropic mixture (boiling point 95° C.) with methyl chloroacetate. After cooling, the organic phase is washed with 250 ml of water and subsequently distilled under reduced pressure to leave, as residue, the compound of formula ##STR37## in the form of a brown oil which solidifies upon cooling to room temperature.

EXAMPLE 82

A mixture of 50 g of 3-aminoacetanilide, 180 g of methyl chloroacetate, 48 g of sodium carbonate and 6 g of sodium bromide is heated to 115° C. with evolution of CO₂ and stirred for 4 hours at this temperature. The water of reaction is distilled continuously from the reactor as an azeotropic mixture (boiling point 95° C.) with methyl chloroacetate. After cooling, the organic phase is washed with 250 ml of water and subsequently distilled under reduced pressure to leave, as residue, a mixture of the compounds of formulae ##STR38## in the ratio 40:40. 

What is claimed is:
 1. A dye of the formula ##STR39## wherein A₁ is chloro or cyano, R₇ is C₁ -C₆ alkyl, Z₁ is a radical of formula ##STR40## and Z₂ is hydrogen or a radical of formula (4).
 2. A dye according to claim 1 of the formula ##STR41## wherein A₁ is chloro or cyano and R₇ is C₁ -C₆ alkyl.
 3. A dye according to claim 1 of the formula ##STR42## wherein A₁ is chloro or cyano and R₇ is C₁ -C₆ alkyl.
 4. A dye according to claim 2, wherein A₁ is chloro and R₇ is methyl.
 5. A dye according to claim 2, wherein A₁ is cyano and R₇ is methyl. 